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BS 1042-2.2:1983
Measurement of fluid flow in closed conduits. Velocity area methods. Method of measurement of velocity at one point of a conduit of circular cross section (British Standard)
Specifies a method for the determination of the volume rate of flow of a single phase fluid of a substantially constant density (Mach number 0,25) under steady fully developed flow conditions in a closed conduit of circular cross-section running full by measurement of the flow velocity in a single point.
British Standards Institution [bsi]